Forum member @stanton detailed his 2011 LEAF battery pack upgrade to a 40 kWh pack here:
I'm guessing he will post here soon, but based on his experience it's definitely going to be an adventure
The hardest part will be finding a battery from a wrecked 2018 or newer LEAF that has an otherwise healthy battery pack. The next big challenge will be finding someone competent and experienced enough to do the installation work.
A copart.com search of your area currently shows 8 potential donor 2018 LEAFs within 200 miles.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV